86 EEPATICJE. 



sides. Antheridia large, solitary in the axils of the perigonial 

 bracts. 



Dimensions. — Stems Ij to 3 inches long, '4 mm. diameter, 

 with leaves 3" mm. wide; leaves, antical lobe 2* mm. x 175 mm., 

 postical '8 mm. X '6 mm., antical 2*1 mm. x 7 mm., postical 

 •75 mm. x '5 mm. ; cells "0325 mm. x '0275 mm., "03 mm. x 

 •025 mm., '03 mm. x '0275 mm., ^03 mm. x -03 mm.; ^025 mm. x 

 025 mm.; stipules 1- mm. x 75 mm., l' mm. x ^85 mm. ; sub-bract, 

 antical lobe 125 mm. x •55 mm., postical "75 mm. x ^35 mm.; bracts, 

 antical lobe 1'6 mm. x 1*3 mm., postical ^75 mm. x '5 mm., antical 

 16 mm. X 1' mm., postical "8 ram. x ^6 nmi. ; bracteole I'l mm. x 

 1- mm. ; perianth 3^ mm. x 2*5 mm., teeth at the mouth '1 mm. 

 longx •I mm. broad, at the base "075 mm. x '05 mm., ^05 mm. x 

 •05 mm. ; pistillidia '225 mm. x "06 mm. ; valves of capsule 

 1*15 mm. X •G mm. ; spores ^055 mm. x '045 mm. ; elaters '2 mm. 

 X '0125 mm. ; male catkin 2^ mm. x 1*25 mm. ; perigonial bract, 

 antical lobe 1^1 mm. x "75 mm., postical '6 mm. x '5 mm. ; peri- 

 gonial bracteole '5 mm. x '4 mm. ; antheridia ^35 mm. x ^3 mm. 



Hab. — In large patches on stones, rocks, and trees, often 

 common, especially in limestone districts. Fruit somewhat rare- 

 1 to 3, 5 to 18. I. 



Found on the Continent and in North America. 

 Obs. — This is the commonest of the British Por^Z/.^-, for distin- 

 guishing characters of which see notes under the other species. It 

 quickly discolours water upon immersion. 



Description of Plate XXX. — Fig. 1. Plant natural size 

 (Engl. Bot.). 2. Portion of branch, antical view x 11 (C. and P. 

 n. 71). 3. Portion of stem, postical view x 11 (ditto). 4-6. 

 Leaves X 11 (ditto). 7. Lobule of leaf x 16 (ditto). 8. Portion 

 of leaf X 290 (ditto). 9, 10. Stipules x 16 (ditto). 11. Sub-bract 

 x24 (Sweden, S. 0. Lindberg). 12, 13. Bracts x 16 (ditto). 

 14. Bracteole x 16 (ditto). 15. Perianth x 11 (ditto). 16. Portion 

 of the mouth of perianth x 85 (ditto). 17. Male catkin x 16 

 (ditto). 18. Perigonial bract X 16 (ditto). 19. Perigonial bract- 

 eole X 24 (ditto). 20. Antheridium x 24 (ditto). 



